A total solar eclipse that will sweep across the United States on Aug. 21 is expected to make a noticeable dent in solar-energy collection, prompting energy workers to concoct workarounds that will help them meet energy demands.

About 115 million years ago, when car-size pterosaurs flew overhead, a tiny mushroom no taller than a chess piece fell into a river and later fossilized — a feat that makes it the oldest-known fossilized mushroom on record, a new study finds.

Scientists have discovered the remains of five Homo sapiens individuals in a cave in Morocco. The fossils date back about 300,000 years, pushing back the origin of humanity at least 100,000 years, they say.